脉冲多普勒信号最大最小频率的估计  

Estimating Maximum and Minimum Frequencies for Pulsed Doppler Signals

作　　者：汪源源[1] 陈斯中[1] 吴晓峰[1] 王威琪[1] 

机构地区：[1]复旦大学电子工程系,上海200433

出　　处：《复旦学报（自然科学版）》1998年第6期782-788,共7页Journal of Fudan University：Natural Science

基　　金：教育部优秀青年教师基金;上海市青年科技启明星计划资助课题

摘　　要：百分比法是脉冲多普勒信号最大频率、最小频率估计的典型方法．由于这种方法对最大频率和最小频率较难同时有高精度的估计，为此提出了两种新方法：改进的百分比法和三直线拟合法．通过对不同信噪比下模拟脉冲多普勒信号估计的比较实验，发现：改进的百分比和三直线拟合法对最大频率、最小频率同时有高的估计精度，其中三直线拟合法的估计性能最优．The percentile method is a typical one to estimate maximum and minimum frequencies for pulsed Doppler signals. Since this method can not lead to high estimation accuracy for both maximum and minimum frequencies, two new methods, the modified percentile method and three lines fitting method, are presented in this paper. From the comparison experiments of estimating simulated pulsed Doppler signals with various signal to noise rations, it is found that the modified percentile method and three lines fitting method have high estimation accuracy for both maximum and minumum frequencies, and the three lines fitting method has the best estimation performance.

关 键 词：脉冲多普勒 最大频率 最小频率 血管疾病 诊断 

分 类 号：R445.1[医药卫生—影像医学与核医学] R543.04[医药卫生—诊断学]